A268761 - cp's OEIS frontend

A268761 Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

n	a(n)
1	2
2	15
3	56
4	223
5	762
6	2607
7	8500
8	27411
9	86622
10	270955
11	838224
12	2573015
13	7841538
14	23759463
15	71619436
16	214933915
17	642504870
18	1914023267
19	5684288136
20	16834582623
21	49732758858
22	146587890015
23	431177727396
24	1265883329827
25	3710027613934

[2, 15, 56, 223, 762, 2607, 8500, 27411, 86622, 270955, 838224, 2573015, 7841538, 23759463, 71619436, 214933915, 642504870, 1914023267, 5684288136, 16834582623, 49732758858, 146587890015, 431177727396, 1265883329827, 3710027613934]

cp's OEIS Frontend

A268761 Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

Table of values

List of values